Lens module and manufacturing method thereof

ABSTRACT

A method of manufacturing a lens module including following is provided. A first lens plate having a plurality of first lens sections, a second lens plate having a plurality of second lens sections and a third lens plate having a plurality of third lens sections are provided. The first lens sections of the first lens plate are separated to form a plurality of first lens units. The second and third lens plates are connected. A relative position between each of the first lens units and one of the second lens sections corresponding to the first lens unit is adjusted. Each of the first lens units and the second lens section corresponding to the first lens unit are connected. The second and third lens sections are separated to form a plurality of second lens units and a plurality of third lens units connected to the second lens units.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a divisional application of U.S. application Ser.No. 13/744,255, filed on Jan. 17, 2013, now pending. The entirety of theabove-mentioned patent application is hereby incorporated by referenceherein and made a part of this specification.

TECHNICAL FIELD

The disclosure relates to an optical device and a manufacturing methodof the optical device, and particularly relates to a lens module and amanufacturing method of the lens.

BACKGROUND

With the trends of microminiaturization and cost reduction of electronicproducts, the wafer level module (WLM) technology has drawn theattention. The WLM technology mainly applies the wafer levelmanufacturing technology to electronic products, so as tomicrominiaturize the electronic products. For example, applying the WLMtechnology to the manufacture of lenses renders the size of the lensesso manufactured significantly smaller than the size of the conventionallenses. Therefore, the manufactured lenses are further applicable to thecamera modules in electronic devices such as laptops, tablets, and cellphones.

The conventional wafer level lens is manufactured by cutting two lensplates. Each of the lens plates has a plurality of lens portions. In themanufacture process of the wafer level lens, the lens portions of thetwo different lens plates need to be precisely aligned to ensure theoptical quality of the wafer level lens. Recently, due to the demands onthe image quality of the consumers, the wafer level lens manufactured bycutting two lens plates cannot satisfy the consumers' demands on imagingquality. Therefore, the manufacturers need to align three lens platesand cut them for obtaining the wafer level lens with a preferablequality. However, aligning the lens portions of three different lensplates is a challenge in the manufacture process.

SUMMARY

The disclosure provides a manufacture method of a lens module. The lensmodule manufactured with the manufacture method has a high opticalquality.

The disclosure provides a lens module with a high optical quality.

An embodiment of the disclosure provides a manufacture method of a lensmodule, including the following. A first lens plate having a pluralityof first lens sections, a second lens plate having a plurality of secondlens sections, and a third lens plate having a plurality of third lenssections are provided. The first lens sections of the first lens plateare separated to form a plurality of first lens units. The second lensplate and the third lens plate are connected, and the second lenssections correspond to the third lens sections. A relative positionbetween each of the first lens units and one of the second lens sectionscorresponding to the first lens unit is adjusted. Each of the first lensunits and the second lens section corresponding to the first lens unitare connected. The second lens sections and the third lens sections areseparated to form the second lens units and the third lens unitsconnected to the second lens units. Each of the first lens units, thesecond lens unit connected to the first lens unit, and the third lensunit connected to the first lens unit form a lens module.

Another embodiment of the disclosure provides a manufacture method of alens module, including the following. A first lens plate having aplurality of first lens sections, a second lens plate having a pluralityof second lens sections, and a third lens plate having a plurality ofthird lens sections are provided. The first lens sections of the firstlens plate are separated to form a plurality of first lens units. Thesecond lens plate are connected with the third lens plate, and thesecond lens sections correspond to the third lens sections. The secondlens sections and the third lens sections are separated to form thesecond lens units and the third lens units connected to the second lensunits. The second lens units and the third lens units form a pluralityof compound lens units. A relative position between each of the firstlens units and one of the compound lens units corresponding to the firstlens unit is adjusted. Each of the first lens units and the compoundlens unit corresponding to the first lens unit are connected to form thelens module.

An embodiment of the disclosure provides a lens module. The lens moduleincludes a first lens unit, a second lens unit, and a third lens unit.The second lens unit is disposed between the first lens unit and thethird lens unit, and has a connecting surface connected with the firstlens unit. The first lens unit has a first cutting surface. The secondlens unit has a second cutting surface. The third lens unit has a thirdcutting surface. The first cutting surface, the second cutting surface,and the third cutting surface are not aligned along a normal directionof the connecting surface. There is an offset of the first cuttingsurface from the second cutting surface and the third cutting surface.

In an embodiment of the disclosure, the second cutting surface and thethird cutting surface are aligned.

In an embodiment of the disclosure, the first lens unit exposes aportion of the connecting surface. The portion of the connecting surfaceexposed by the first lens unit is disposed between the first cuttingsurface and the second cutting surface.

In an embodiment of the disclosure, the lens module further includes abonding material. The bonding material is disposed between the first andsecond lens units and covering the portion of the connecting surfaceexposed by the first lens unit.

In an embodiment of the disclosure, the first lens unit includes a firstlight-transmitting substrate and at least one first lens film disposedon the first light-transmitting substrate. The first lens film has afirst lens portion. The second lens unit includes a secondlight-transmitting substrate and at least one second lens film disposedon the second light-transmitting substrate. The second lens film has asecond lens portion. The third lens unit includes a thirdlight-transmitting substrate and at least one third lens film disposedon the third light-transmitting substrate. The third lens film has athird lens portion.

In an embodiment of the disclosure, an influence of a standard offset ofthe first lens unit from the second lens unit and the third lens unit onan optical property of the lens module is greater than an influence ofthe standard offset of the third lens unit from the first lens unit andthe second lens unit on the optical property of the lens module. Theinfluence of the standard offset of the first lens unit from the secondlens unit and the third lens unit on the optical property of the lensmodule is greater than an influence of the standard offset of the secondunit from the first lens unit and the third lens unit on the opticalproperty of the lens module.

In an embodiment of the disclosure, the standard offset is a standardoffset distance between an optical axis of one of the first, second, andthird lens units and optical axes of other two of the first, second, andthird lens units.

In an embodiment of the disclosure, the optical property of the lensmodule is a modulation transfer function of the lens module.

In an embodiment of the disclosure, adjusting the relative positionbetween each of the first lens units and the second lens sectioncorresponding to the first lens unit is to substantially align anoptical axis of each of the first lens units with an optical axis of thesecond lens section corresponding to the first lens unit.

In an embodiment of the disclosure, the first lens plate includes afirst light-transmitting substrate and at least one first lens filmdisposed on the first light-transmitting substrate. The first lens filmhas a plurality of first lens portions. Each of the first lens portionsand a part of the first light-transmitting substrate overlapped with thefirst lens portion form the first lens section. The second lens plateincludes a second light-transmitting substrate and at least one secondlens film disposed on the second light-transmitting substrate. Thesecond lens film has a plurality of second lens portions. Each of thesecond lens portions and a part of the second light-transmittingsubstrate overlapped with the second lens portion form the second lenssection. The third lens plate includes a third light-transmittingsubstrate and at least one third lens film disposed on the thirdlight-transmitting substrate. The third lens film has a plurality ofthird lens portions. Each of the third lens portions and a part of thethird light-transmitting substrate overlapped with the third lensportions form the third lens section.

In view of the foregoing, in the manufacturing method of manufacturinglens module according to an embodiment of the disclosure, the mostsensitive lens units in the lens modules are respectively aligned withanother lens sections or compound lens units. Therefore, the lens modulemanufactured with the method has a high optical quality.

Several exemplary embodiments accompanied with figures are described indetail below to further describe the disclosure in details.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide further understanding,and are incorporated in and constitute a part of this specification. Thedrawings illustrate exemplary embodiments and, together with thedescription, serve to explain the principles of the disclosure.

FIG. 1 is a flowchart illustrating a manufacturing method of a lensmodule according to an embodiment of the disclosure.

FIGS. 2A to 2G are cross-sectional schematic views illustrating amanufacturing method of a lens module according to an embodiment of thedisclosure.

FIG. 3 is a schematic view illustrating that a relative position betweena first lens unit and one corresponding of the second lens sections isadjusted.

FIG. 4 is a flowchart illustrating a manufacturing method of a lensmodule according to an embodiment of the disclosure.

FIGS. 5A to 5G are cross-sectional schematic views illustrating amanufacturing method of a lens module according to an embodiment of thedisclosure.

DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS The First Embodiment

Manufacturing Method of Lens Module

FIG. 1 is a flowchart illustrating a manufacturing method of a lensmodule according to an embodiment of the disclosure. Referring to FIG.1, a manufacturing method of a lens module in this embodiment includesthe following. A first lens plate having a plurality of first lenssections, a second lens plate having a plurality of second lenssections, and a third lens plate having a plurality of third lenssections are provided (Step S110). The first lens sections of the firstlens plate are separated to form a plurality of first lens units (StepS120). The second lens plate and the third lens plate are connected. Inaddition, the second lens sections are correspond to the third lenssections (Step S130). A relative position between each of the first lensunits and one of the second lens sections corresponding to the firstlens unit is adjusted (Step S140). Each of the first lens units and thesecond lens section corresponding to the first lens unit are connected(Step S150). The second lens sections and the third lens sections areseparated to form a plurality of second lens units and a plurality ofthird lens units connected with the second lens units, wherein each ofthe first lens units, the second lens unit connected to the first lensunit, and the third lens unit connected to the first lens unit form alens module (Step S160).

It should be noted that in this embodiment, Steps S110, S120, S130,S140, S150, and S160 are proceeded in sequence. However, the disclosureis not limited thereto. A sequence of Steps S110, S120, S130, S140,S150, and S160 may be adaptively adjusted. For example, in otherembodiments, a sequence of Steps S110, S120, S140, S150, S130, and S160,a sequence of Steps S110, S130, S120, S140, S150, and S160, or asequence of Steps S110, S130, S120, S140, S150, and S160 may beproceeded.

The manufacturing method of the lens module according to an embodimentof the disclosure is described in detail below with reference to FIGS.2A to 2G. FIGS. 2A to 2G are cross-sectional schematic viewsillustrating a manufacturing method of a lens module according to anembodiment of the disclosure. Referring to FIGS. 2A, 2B, and 2C, a firstlens plate 100 having a plurality of first lens sections A, a secondlens plate 200 having a plurality of second lens sections B, and a thirdlens plate 300 having a plurality of third lens sections C are provided.The first lens sections A are connected to each other. The second lenssections B are connected to each other. The third lens sections C areconnected to each other.

The first lens plate 100 of this embodiment includes a firstlight-transmitting substrate 110 and at least one first lens film 120disposed on the first light-transmitting substrate 110. The first lensfilm 120 has a plurality of first lens portions 122. Each of the firstlens portions 122 and a part of the first light-transmitting substrate110 overlapped with the first lens portion 122 form the first lenssection A. The first lens portion 122 may be a concave lens, forexample, but the disclosure is not limited thereto. The first lensportion 122 may also be a convex lens or a lens in other appropriateforms.

The second lens plate 200 of this embodiment includes a secondlight-transmitting substrate 210 and at least one second lens film 220disposed on the second light-transmitting substrate 210. The second lensfilm 220 has a plurality of second lens portions 222. Each of the secondlens portions 222 and a part of the second light-transmitting substrate210 overlapped with the second lens portion 222 form the second lenssection B. In this embodiment, the second lens portion 220 may be aconcave lens, for example, but the disclosure is not limited thereto.The second lens portion 220 may also be a convex lens or a lens in otherappropriate forms.

The third lens plate 300 of this embodiment includes a thirdlight-transmitting substrate 310 and at least one third lens film 320disposed on the third light-transmitting substrate 310. The third lensfilm 320 has a plurality of third lens portions 322. Each of the thirdlens portions 322 and a part of the third light-transmitting substrate310 overlapped with the third lens portions 322 form the third lenssection C. The third lens portion 322 may be a concave lens, a convexlens, or a lens in other appropriate forms. The first light-transmittingsubstrate 110, the second light-transmitting substrate 210, and thethird light-transmitting substrate 310 may be glass substrates, such asa glass wafer. However, the disclosure is not limited thereto. In otherembodiments, the first light-transmitting substrate 110, the secondlight-transmitting substrate 210, and the third light-transmittingsubstrate 310 may also be light-transmitting substrates of othermaterials.

Referring to FIGS. 2A and 2D, the first lens sections A of the firstlens plate 100 are then separated to form a plurality of first lensunits A′. In this embodiment, a cutting tool may be used to cut thefirst lens plate 100 to form the first lens units A′ separated from eachother. However, the disclosure does not limit on a method of separatingthe first lens sections A. In other embodiments, the first lens sectionsA may be separated by laser cutting or other appropriate ways to obtainthe first lens units A′.

Referring to FIG. 2E, the second lens plate 200 and the third lens plate300 are then connected, and the second lens sections B are correspond tothe third lens sections C. More specifically, in this embodiment, abonding material (not shown) may be formed on the third lens plate 300.Then, alignment marks on the second lens plate 200 and the third lensplate 300 are used to align the second lens portions 222 of the secondlens plate 200 with the third lens portions 322 of the third lens plate300. The boding material is then solidified, such that a relativeposition between the second lens plate 200 and the third lens plate 300are fixed.

Referring to FIG. 2F, a relative position between each of the first lensunits A′ and one of the second lens sections B corresponding to thefirst lens unit A′ is adjusted. In this embodiment, adjusting therelative position between each of the first lens units A′ and the secondlens section B corresponding to the first lens unit A′ may be tosubstantially align an optical axis X1 of the first lens units A′ withan optical axis X2 of the second lens section B corresponding to thefirst lens unit A′. FIG. 3 is a schematic view illustrating that arelative position between a first lens unit and one corresponding of thesecond lens sections is adjusted. Referring to FIG. 3, in thisembodiment, an adjustment machine M may be used to hold opposite cornersof the first lens unit A′ to move the first lens unit A′, such that theoptical axis of the first lens unit A′ is as aligned as possible withthe optical axis of the second lens section B corresponding to the firstlens unit A′. However, the disclosure is not limited thereto. In otherembodiments, the relative position between the first lens unit A′ andthe second lens section B′ corresponding to the first lens unit A′ maybe adjusted in other ways.

Then, each of the first lens units A′ and the second lens section Bcorresponding to the first lens unit A′ are connected. Specifically, inthis embodiment, a bonding material S may be formed on the first lensunit A′ or the second lens section B before the relative positionbetween the first lens unit A′ and the second lens section B isadjusted. The bonding material Sis then used to preliminarily adhere thefirst lens unit A′ onto the second lens section B corresponding to thefirst lens unit A′. Then, after the relative position of the first lensunit A′ and the second lens section B corresponding to the first lensunit A′ is adjusted, the bonding material Sis then solidified, such thatthe first lens unit A′ is fixed on the second lens section Bcorresponding to the first lens unit A′ at a correct position.

Referring to FIGS. 2F and 2G, the second lens sections B of the secondlens plate 200 and the third lens sections C of the third lens plate 300are then separated to form a plurality of second lens units B′ and aplurality of third lens units C′ connected to the second lens units B′.Each of the first lens units A′, the second lens unit B′ connected tothe each of the first lens units A′, and the third lens unit C′ form alens module 1000. In other words, in this embodiment, the second lenssection B and the third lens section C corresponding to the second lenssection B are separated together and form the lens module 1000 with thefirst lens unit A′ that is already connected to the second lens sectionB.

It should be noted that an influence of a standard offset of the firstlens unit A′ from the second lens unit B′ and the third lens unit C′ onan optical property of the lens module 1000 is greater than an influenceof the standard offset of the third lens unit C′ from the first lensunit A′ and the second lens unit B′ on the optical property of the lensmodule 1000. In addition, the influence of the standard offset of thefirst lens unit A′ from the second lens unit B′ and the third lens unitC′ on the optical property of the lens module 1000 is greater than aninfluence of the standard offset of the second unit B′ from the firstlens unit A′ and the third lens unit C′ on the optical property of thelens module 1000.

For example, given that an optical axis of the second lens unit B′ isaligned with an optical axis of the third lens unit C′, and there is astandard offset distance(0.005 μm, for example) of the optical axis ofthe first lens unit A′ from the optical axes of the second lens unit B′and the third lens unit C′, a modulation transfer function (MTF) of thelens module 1000 has a first variation. Given that the optical axis ofthe first lens unit A′ is aligned with the optical axis of the thirdlens unit C′, and there is the standard offset distance (0.005 μm, forexample) of the optical axis of the second lens unit B′ from the opticalaxes of the first lens unit A′ and the third lens unit C′, themodulation transfer function (MTF) of the lens module 1000 has a secondvariation. Given that the optical axis of the first lens unit A′ isaligned with the optical axis of the second lens unit B′, and there isthe standard offset distance (0.005 μm, for example) of the optical axisof the third lens unit C′ from the optical axes of the first lens unitA′ and the second lens unit B′, the modulation transfer function (MTF)of the lens module 1000 has a third variation. The first variation isgreater than the second and third variations.

In other words, deviation of the first lens unit A′ has the greatestinfluence on an optical quality on the lens module 1000 if the firstlens unit A′ is deviated other lens units in the lens module. Therefore,in this embodiment, the most sensitive lens units A′ are aligned withthe second lens sections B corresponding to the most sensitive lensunits A′ in a one-by-one manner to complete the lens modules 1000. Thelens modules 1000 manufactured in this method have high opticalqualities.

Lens Module

Referring to FIG. 2G, the lens module 1000 includes the first lens unitA′, the second lens unit B′, and the third lens unit C′. The lens secondunit B′ is disposed between the first lens unit A′ and the third lensunit C′. The first lens unit A′ includes the first light-transmittingsubstrate 110 and at least one first lens portion 122. The second lensunit B′ includes the second light-transmitting substrate 210 and atleast one second lens portion 222. The third lens unit C′ includes thethird light-transmitting substrate 310 and at least one third lensportion 322. The first lens portion 122, the second lens portion 222,and the third lens portion 322 are not limited to be a convex lens or aconcave lens. The manufacturer may design forms of the first lensportion 122, the second lens portion 222, and the third lens portion 322based on practical needs.

The second lens unit B′ has a connecting surface S4 connected with thefirst lens unit A′. The first lens unit A′ has a first cutting surfaceS1. The second lens unit B′ has a second cutting surface S2. The thirdlens unit C′ has a third cutting surface S3. It should be noted thefirst cutting surface S1, the second cutting surface S2, and the thirdcutting surface S3 are not aligned along a normal direction n of theconnecting surface S4, and there is an offset S of the first cuttingsurface Si from the second cutting surface S2 and the third cuttingsurface S3, wherein the offset Sis not equal to zero. In thisembodiment, the second cutting surface S2 and the third cutting surfaceS3 are aligned. The offset S may be a distance between the first cuttingsurface Si and the second cutting surface S2. However, the disclosure isnot limited thereto. In other embodiments, the offset S may be anincluded angle between the first cutting surface S1 and the secondcutting surface S2.

Furthermore, the first lens unit A′ of this embodiment exposes a portionof the connecting surface S4. The portion of the connecting surface S4exposed by the first lens unit A′ is disposed between the first cuttingsurface Si and the second cutting surface S2. The lens module 1000 inthis embodiment further includes the bonding material S disposed betweenthe first lens unit A′ and the second lens unit B′. The bonding materialS covers the portion of the connecting surface S4 exposed by the firstlens unit A′. The lens module 1000 is manufactured with the methoddescribed above. The lens module 1000 has a high optical quality.

The Second Embodiment

Manufacturing Method of Lens Module

A manufacturing method of a lens module in this embodiment is similar tothe manufacturing method of the lens module in the first embodiment, soidentical components are referred with the same numbers. Only thedifferences between the methods are described, and the similarities willnot be reiterated hereinafter.

FIG. 4 is a flowchart illustrating a manufacturing method of a lensmodule according to an embodiment of the disclosure. Referring to FIG.4, a manufacturing method of a lens module in this embodiment includesthe following. A first lens plate having a plurality of first lenssections, a second lens plate having a plurality of second lenssections, and a third lens plate having a plurality of third lenssections are provided (Step S210). The first lens sections of the firstlens plate are separated to form a plurality of first lens units (StepS220). The second lens plate and the third lens plate are connected. Inaddition, the second lens sections are correspond to the third lenssections (Step S230). The second lens sections and the third lenssections are separated to form a plurality of second lens units and aplurality of third lens units connected with the second lens units,wherein the second lens units and the third lens units form a pluralityof compound lens units (Step S240). A relative position between each ofthe first lens units and one of the compound lens units corresponding tothe first lens unit is adjusted (Step S250). Each of the first lensunits and the compound lens unit corresponding to the first lens unitare connected to form a lens module (Step S260).

It should be noted that in this embodiment, Steps S210, S220, S230,S240, S250, and S260 are proceeded in sequence. However, the disclosureis not limited thereto. A sequence of Steps S210, S220, S230, S240,S250, and S260 may be adaptively adjusted. For example, in otherembodiments, a sequence of Steps S210, S230, S240, S220, S250, and S260,or a sequence of Steps S210, S230, S220, S240, S250, and S260 may beproceeded.

The manufacturing method of the lens module according to an embodimentof the disclosure is described in detail below with reference to FIGS.5A to 5G. FIGS. 5A to 5G are cross-sectional schematic viewsillustrating a manufacturing method of a lens module according to anembodiment of the disclosure. Referring to FIGS. 5A, 5B, and 5C, thefirst lens plate 100 having the first lens sections A, the second lensplate 200 having the second lens sections B, and the third lens plate300 having the third lens sections C are provided.

Referring to FIGS. 5A and 5D, the first lens sections A of the firstlens plate 100 are separated to form the first lens units A′. Referringto FIG. 5E, the second lens plate 200 and the third lens plate 300 arethen connected, and the second lens sections B are correspond to thethird lens sections C. Referring to FIGS. 5E and 5F, the second lenssections B and the third lens sections C are separated to form thesecond lens units B′ and the third lens units C′ connected to the secondlens units B′. The second lens units B′ and the third lens units C′ forma plurality of compound lens units D′. In this embodiment, each of thesecond lens units B and one of the third lens sections C correspondingto the second lens unit B are separated together to form the compoundlens unit D′.

Referring to FIG. 5G, a relative position between each of the first lensunits A′ and one of the compound lens units D′ corresponding to thefirst lens unit A′ is adjusted. In this embodiment, adjusting therelative position between each of the first lens units A′ and one of thecompound lens units D′ corresponding to the first lens unit A′ may be tosubstantially align the optical axis X1 of each of the first lens unitsA′ with an optical axis X3 of the corresponding compound lens unit D′.Similar to the first embodiment, in this embodiment, an adjustmentmachine may be used to hold the opposite corners of the first lens unitA′ to move the first lens unit A′, such that the optical axis of thefirst lens unit A′ is as aligned as possible with the optical axis X3 ofthe compound lens unit D′. Then, the first lens units A′ and thecorresponding compound lens units D′ are connected to form the lensmodules 1000.

Similar to the first embodiment, each of the most sensitive lens unitsA′ is aligned and connected with the corresponding compound lens D′ in aone-by-one manner. Therefore, the lens module 1000 manufactured withthis method of manufacturing the lens module in this embodiment may alsohave a high optical quality.

In view of the foregoing, in the manufacturing method of manufacturinglens module according to an embodiment of the disclosure, the mostsensitive lens units in the lens modules are respectively aligned withanother lens sections or compound lens units. Therefore, the lens modulemanufactured with the manufacturing method of lens module according toan embodiment of the disclosure has a high optical quality.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of thedisclosed embodiments without departing from the scope or spirit of thedisclosure. In view of the foregoing, it is intended that the disclosurecover modifications and variations of this disclosure provided they fallwithin the scope of the following claims and their equivalents.

What is claimed is:
 1. A lens module, comprising: a first lens unit; asecond lens unit; and a third lens unit, wherein the second lens unit isdisposed between the first and third lens units and has a connectingsurface connected with the first lens unit, the first lens unit has afirst cutting surface, the second lens unit has a second cuttingsurface, and the third lens unit has a third cutting surface, whereinthe first, second and third cutting surfaces are not aligned along anormal direction of the connecting surface, and there is an offset ofthe first cutting surface from the second cutting surface and the thirdcutting surface.
 2. The lens module as claimed in claim 1, wherein thesecond and third cutting surfaces are aligned.
 3. The lens module asclaimed in claim 1, wherein the first lens unit exposes a portion of theconnecting surface, and the portion of the connecting surface exposed bythe first lens unit is disposed between the first cutting surface andthe second cutting surface.
 4. The lens module as claimed in claim 3,further comprising: a bonding material, disposed between the first andsecond lens units and covering the portion of the connecting surfaceexposed by the first lens unit.
 5. The lens module as claimed in claim1, wherein the first lens unit comprises a first light-transmittingsubstrate and a first lens film disposed on the first light-transmittingsubstrate and having a first lens portion, the second lens unitcomprises a second light-transmitting substrate and a second lens filmdisposed on the light-transmitting substrate and having a second lensportion, and the third lens unit comprises a third light-transmittingsubstrate and a third lens film disposed on the light-transmittingsubstrate and having a third lens portion.
 6. The lens module as claimedin claim 1, wherein an influence of a standard offset of the first lensunit from the second lens unit and the third lens unit on an opticalproperty of the lens module is greater than an influence of the standardoffset of the third lens unit from the first lens unit and the secondlens unit on the optical property of the lens module, and the influenceof the standard offset of the first lens unit from the second lens unitand the third lens unit on the optical property of the lens module isgreater than an influence of the standard offset of the second lens unitfrom the first lens unit and the third lens unit on the optical propertyof the lens module.
 7. The lens module as claimed in claim 6, whereinthe standard offset is a standard offset distance between an opticalaxis of one of the first, second, and third lens units and optical axesof other two of the first, second, and third lens units.
 8. The lensmodule claimed in claim 6, wherein the optical property of the lensmodule is a modulation transfer function of the lens module.